Carrier scraper



April 11, 1939. R. E VOTE- I CARRIER SCRAPER Filed July 20, 1957 4 Shets-Sheet 1 /1 Q /m mu INVENTOR R V0 E e April 11, 1939. R. E. VOTE CARR IER ISCRAPER Fild July 20, 1957' 4 sneets sneet 2 INV ENTOR R. E. V0 is April,ll, 1939. R. E. VOTE CARRIER SCRAPER F iled Jul y go, 1 37 4 sheetssheet 3 ATTORNEY A ril 11, 1939.

R. E. VOTE 1 CARRIER'SCRAPER Filed July 20, 1937' 4 Sheets-Sheet .4

9 z u 4 n 2 H 4 1 w 0 5 I F 2 9 3 w 7 H 2 1 3 w 1 2 L INVEIGTOIR Vote BY Qu gmm ATTORNEY Patented Apr. 11, 1939 UNITED STATES PATENT OFFICE Claims.

. This invention relates to wheeled scrapers of the tractor drawn leveler type, one object of my invention being to provide an improved form of bowl and a simplified and I believe novel arrangement for dumping the load from the bowl so that a minimum amount of the weight of the scraper has to be lifted in effecting such dumping.

Another object is to provide a front dirt retaining apron arranged in connection with the bowl dumping means so that it is moved out of the way and most of the dirt discharged therefrom before the main load is discharged.

A further object is to provide a simple mounting of the scraper as a whole for vertical adjustment of the cutting blade and a means for easily and accurately effecting such adjustment as the desired depth of cut or level of discharge determines.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similarcharacters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of the scraper.

Figure. 2 is an enlarged sectional elevation of the bowl in its scraping or carrying position.

Figure 3 is a similar view, showing the apron and the bottom plate of the bowl in a load dis charging position.

Figure 4 is a transverse section on the line H of I lg. 2.

Figure 5 is a cross section on the line 5-5 of Fig. 2.

Referring now more particularly to the characters of reference on the drawings, the body of the scraper comprises side plates I reinforced by iongitudinal outside beams 2, vertical front outside beams 3 and longitudinal diagonal beams 4 ex tending between the longitudinal and vertical beams. These different beams may be considered as constituting the frame of the scraper. At its rear end beyond the side plates the scraper is supported by wheels'5.

Extending forwardly from the top of the beams 3 rigid therewith and converging relative to each other are horizontal beams 6 which at their .forward end terminate in a depending neck 1. This neck engages a block 8 mounted in connection with the neck for swivel movement in a horizontal plane. The block ahead of the neck is pivoted for relative swinging movement in a vertical plane on the rear end of an arm 9. At its forward end this arm is pivoted as at-IO on a tongue II which at its forward end is provided with a universal joint member I2 adapted for supporting conne'ction with the drawbar of a tractor.

A- short distance rearwardly of the pivot III the tongue supports the axle I3 of the front wheel truck I4, this axle being mounted on the tongue for swivel movement in a vertical transverse plane.

Rigid with the arm 9 at its pivoted end and upstanding therefrom is another relatively long arm I5, said arms 9 and I5 thus forming in effect a bellcrank lever. The arm I5 at its other end supports a sheave block I6 which is in line with a cooperating sheave block II fixed on the tongue ahead of said arm. A pull cable It extends from a power unit on the tractor (not shown) over and between the pulleys of the blocks to an anchor I9 on the tongue. It will thus be seen that by pulling the cable the arm 9 will be raised, raising the 'scraper body about the rear wheels 5 as an axis. The position of the pivot of the arms 9 and I5 relative to the front wheel axle is such that the relatively great weight of the scraper and its load may be easily lifted without any material tendency to tip the tractor. The relatively great length of the arm I5 as compared with the arm 9 provides an advantageous leverage which will enable a minimum of power to be used in operating the same, and enables accurate control of the scraping level to be readily attained. The front wheel truck and tongue unit being pivoted on the scraper frame for horizontal swivel movement at the block 8, provides for turning a very small radius as will be evident.

Connecting the side plates l at intervals in their length andat the bottom are cross beams 29, which normally support but are not connected to the bottom plate 2| of the scraper. A cutting blade 22 is mounted across and is rigid with the front of the bottom plate, and upstanding from the side edges of the blade are mounted ears 23 which support trunnions 2t turnably mounted in and projecting through the side plates below the side beams 2. Rigid with and upstanding from the bottom plate 2| is a back plate 25, curved about the trunnions 23 as an axis. The

of the tractor of the apparatus as a whole about back and bottom plate together with the side plates I, form the bowl of the scraper.

A similarly curved-beam 26 is disposed inside the back plate centrally of its width and extends upwardly to the top of the same. At its upper end it is secured on a cross beam 21 which extends over the top of the plates I and which is rigidly connected to side bars 28 which extend to and engage the trunnions. In order to maintain the side bars as close to the side plates I' as possible, while disposing said bars outside the plates and thus clear of the dirt, the beams 2 and 4 are longitudinally slotted as at 29 (see Fig. 4) for the extent necessary to allow the full movement of the bars.

The front apron of the scraper is in the form of a flat plate 30 extending upwardly and forwardly at a relatively shallow angle to the horizon from a lower termination normally adjacent but above the blade 22 as shown in Fig. 3. Mounted on the underside of the apron at its sides are V- rollers 3| engaging similarly shaped rails 32. These rails are secured at their lower ends on the side plates I on the inside and extend upwardly to connections with a cross beam 33 mounted on and under the top beams 6.

Mounted on and extending between the side plates I toward the upper end of the apron when the latter is lowered is a scraper blade 34. Compression springs 35 between the beam 33 and the underside of the apron yieldably force the latter down, its movement being limited by a suitable stop 36 on the apron engaging the scraping plate. The upward movement of the apron is limited by engagement of the same with the underside of the converging beams 6.

A sheave block 31 is mounted on the front upper end of the apron and another sheave block 38 is mounted on the beam 33 centrally between the beams 6; the axes of the blocks lying in a plane parallel to the apron so as to give a straight pull. Another sheave block 39 is secured on the cross beam 21. A cable 40 from the tractor power unit extends first to and between the pulleys of the blocks 38 and 31, and then extends between the pulleys of the blocks 38 and 39 to a final anchor on or adjacent the latter. In this manner a pull on the cable tends to lift the apron first, and since the load and weight of the apron is always less than that of the bottom plate 2|, the apron will be lifted before any lifting action is imparted to the bottom plate. This opens up a wide gap between the blade 22 and the apron allowing the adjacent mass of dirt to slide onto the ground. The load on the bottom plate is thus considerably relieved before said plate is lifted, and the power necessary to operate the control cable is correspondingly reduced.

The bottom plate may be raised to a substantially vertical position, insuring complete discharge of all the dirt, and on account'of the position of the trunnions relative to the blade, the level of the latter remains substantially constant irrespective of the amount of tilting of the bottom plate and blade. The scraper after being loaded may thus be adjusted by manipulation of the cable l8 to set it. to level to a certain depth, and this adjustment may remain undisturbed all the time the bottom plate is bein raised.

The load when scraping is of course taken at the scraping blade, and since the mounting trunnions are immediately adjacent the blade and take all the strains, the bottom and side plates themselves may be made relatively light, since they do not have to stand any heavy compressing or pulling strains. The bottom and back plates being the only parts of the scraper which are actually lifted when dumping of the load is being carried out, less power is necessary to effect this operation than when the entire bowl structure must be raised as is the case with ordinary scrapers.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device,

still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

1. A scraper comprising a frame mounted for movement along the ground, side plates on the frame, a bottom and back plate unit disposed between the side plates and forming a bowl therewith, pivot trunnions mounted on the unit at the sides and adjacent the forward end of the bottom plate, said trunnions projecting to the outside of the side plates, a cross beam at the back of the unit extending over the side plates, bars extending forwardly from and rigid with the beam and engaging the trunnions at their outer end, and pull means applied to the unit at the rear in a direction to swing the unit about the trunnions.

2. A scraper comprising a frame mounted for movement along the ground, side plates rigid with the frame, a bottom and back plate unit disposed and movable between the side plates and forming a bowl therewith, a scraping blade across and rigid with the front end of the bottom plate, means pivotally supporting the unit in connection with the frame and side plates at a point above and in a Vertical plane near the front edge of the blade whereby tilting of the unit about said pivot means to any position relative to the side plates will not materially alter the level of the scraping edge of the blade, and means applied to the unit to tilt the same about its pivot means.

3. A scraper comprising a frame mounted for movement along the ground, side plates rigid with the frame, means included in part with the side plates forming a forwardly tiltable bowl having its front edge rearwardly of the front end of the side'plates, a flat plate forming a dirt retaining apron extending upwardly and forwardly between .the plates from in front of the bowl, means slidably guiding the apron for lengthwise movement in a fixed plane relative to the side plates, and means to control the movement of the apron.

4. A scraper comprising a frame mounted for movement along the ground, side plates rigid with the frame, means included in part with the side plates forming a forwardly tiltable bowl having its front edge rearwardly of the front end of the side plates, a flat plate forming a dirt retaining apron extending upwardly and forwardly between the plates from in front of the bowl, rails rigid with the side plates disposed below the apron, rollers on the apron engaging the rails and disposed with their axes at right angles to the apron plate, and means to control the movement of the apron.

5. A structure as in claim 4, with a compression spring under and extending lengthwise 0f the apron; an element rigid with the apron inter mediate its ends and against which the rear end of the spring bears, and an element fixed on the frame against which the forward end of the spring bears; said spring functioning to move the apron rearwardly to a predetermined position relative to the front end of the bowl.

RUSSELL E. VOTE. 

